Annealing-box.



EATENTED mam, 190a.- w. B. BENNETT.

ANNBALING BOX.

APPLICATION FILED MAE. 6, IZi DR.

mwzea'ron. 7AM- WITNESSES.

UnITEED sTA'rns PATENT erases. I I

TO UNION STEEL CASTING COMPANY, OF PITTSBURG, PENNSYLVANIA, A CORPORATION -OF PENNSYLVANIA.

To all whom it may concern:

Be it known that I, VVILLIAM B. BENNETT,- a resident of Ross township, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Annealing-Boxcs; and I-do hereby declare the followin to be a full, clear, and exact description fiiereof.

This invention relates to annealing boxes and especially to such boxes formed of cast steel or other cast metal.

The object of the invention is to strengthen such boxes and especially the top )ortion thereof so as to greatly increase t e life thereoh.

Annealing boxes are subjected to intense and long continued heat which softens the metal and causes the roof to sag by its weightand push the up er portions of the side walls outwardly. lliis not only greatly distorts the box, but eventually causes the entire box -to collapse. .Variousattempts this type of box.

have been'made to overcome this defect. Patent No. 870,558, granted November 12, 1907, to John B. Henry shows and describes an integral cast annealing'box with a. truss .member connecting the sides near their the tie member or chord of the truss on t e line 3-3, Fig. 2 Fig. 4 is a detail horizontal section on the line ,44, Fig. 3 on an enlarged scale; and Fig. 5 is a horizontal sectional view showing a modification.

The annealing box shown in the drawin is rovided with the usual side walls 1 end we ls 2 and arched roof 3, these parts being formed as a sin le integral casting and the side and end wal s being stiffened or strengthened by horizontal ribs 4, all as is usual in The usual trunnions 5 are provided for lifting the box. The side and end wallsat their bottoms are also flanged or Specification of Letters Patexit. Application filed March 6, 1908. Serial No. 119,698.

mnnanmanox.

Patented Aug. 11, 1908.

tops, and substantially at the point where i v WILLIAM B. BENNETT, OF ROSS TOWNSHIP, ALLEGHENY COUNTY, PENNSYLVANIA, ASSIGNOR- the arched roof springs from said side walls, 1s a transverse tie member or members 7,

the drawings showing three such members in the box 1llustrated,*b ut the number 'will vary accordin to the length of the box.

These tiemembers are cast integral with the.

box and are connected-to the roof b one or more struts or supports 8, althoug if desired, a w eb may take the place of the struts. For the sake of ightness, however, the struts are 1 preferred and in efi'ectform an open web.-

is tie-members 7 are in effect .tension chords of tru scs, whose to chordsare the roof 3 and whose struts are t e parts 8. The

chords? act "as tension members to prevent" the side wallsof the box bulging out due to the outward thrirst of the saggm roof. -Consequently the distortion of t 1e ex is almost entirely preventedxv The box so far described is substantially the same as that illustrated and described in the patent No. 870,558 above referred to.-

I have added several improvements thereto. One improvement consists in providingthe chord 7 on its lower edge with a bulb or thickened portion 10 so as to give additional strength to this part andprevent the formationof checks and cracks in the cooling of the metal after casting. The bulbs [10 are formed in casting the box by merelymodifgin the shape'oi the' attom. They p'rovi e suilieient metal at t 1e lower edges of the chord 7 so that in cooling after casting 903 shrinka e checks or cracks are not likely to occur, the bulk of metal being sufficient to hold the heat sufficiently long to prevent this.

Another improvement consists in providing a. transverse reinforcement member formed of wrought metal, such as wrought iron or steel, and having its endsextend ng,

Figs...

into and embedded in theside walls. -1-to 4 show this reinforcement membe as a wrought metal bar 11 embedded an enveloped in the lower edge of thc chord ,7, and

havin its ends formed with anchoring nieans embedded in the side walls. As shown in these views the ends of the bar are split and.

forked outwardly, as at .12; to provide the anchors. This a r will be' placed-in thei mold prior to pouring, the extreme end por-- go or square bar, or deforinim the same in any of the well known ways. ig. 4 shows a we known form of deformed bar. a This gives a strong grip or attachment of the cast metal on the same. This reinforcing bar is of metal of different character from the metal constituting the chord of the truss and has a slightly diiferent coefficient of expansion. It also is a fibrous metal so that any cracks which may be developed in the cast chord in the cooling of the box, or in its use, will stop when they reach such reinforcement bar. Being formed of a metal of a different coefiicient of expansion, it also neutralizes to some'extent the expansion and contraction andto that extent assists in preventing distortion of the box.

, Fig. 5 shows a modification in which the roof and side walls, said tie rnmber having" abulbous lower. edge, all said parts being a single integral casting.

' 2. An annealing box having side and end walls and roof, and a truss member connectin the sides at the juncture of the roof and si e walls and supporting the roof, said truss member having a bulbous lower edge, all

said parts be 0 a sin le integral casti l 0 d end 5 3. An annea ing box having side an walls and roof, a chord extending between the sides at the juncture of the roof and sidewalls, said chord having a bulbous. lower edge, and struts ext-end' -from said chord to the roof, all said parts sing a single integral casting.

4. An annealing box having side and end walls and roof, a transverse tie member-com met the sides at the juncture of the root and Sit e walls, all said parts being a shigle" inte ral casting, said tie member having embedded therein a wrought metal reznforcmg bar. extending into the S1d6 wells.

5. An annealing box having side and end walls and roof, and a truss member connectmg the sides at the uncture or the roofand s1 e i or more domes, or of any other desired delower edge, struts extending from said chord 60 sign, with substantially equally beneficial reto the roof, all said parts being a single insults. tegral casting, and a wrought metal reinforc- What I claim is: ing bar embedded in the thickened portion l walls and supporting the roof, all said parts being a single integraLcestlig, and a wrought met-e1 reinforcing bar embedded in said truss and extending into the side walls. 5

6. An annealing box comprising side and end walls and a roof, a chord extending be tween the sides at the juncture of the roof and side walls, struts extending from said chord to the roof, all said parts a single o integral casting, and a wrought metal rem- 5 forcing her emoeddcd in said chord. l

' 7. An annealing box having side and end walls and roof, a transverse tie member connecting the sides at the juncture of the roof 5 and side walk, all said parts being a single integral casting, and a; wrought metal remforcingbar embedded in said tie member and extending into the side walls and m vided with anchoring means embedded in said side walls.

8. An mrnealing box having side and end walls and a roof a transverse tie member connecting the siues at the juncture of the roof and side walls and rovided with a 15 thickened portion, all sai parts being a single integral casting, and a wrought metal reinforcing bar embedded in the thickened portion of said tie member.

9. An annealing box having side and end 2 'walls and a roof, a transverse chord extending between the sides'at the juncture of the roof and side walls and having a thickened transverse reinforcin bar 11 is used without a cast'chord 7 and struts 8. In this case 30 the her may be of regular cross section but I provided at its ends with suitable anchoring i, means, such as slitting the same and turning its ends-outwardly, as shown. The ends of \f thebar do not extend out through the side 85 walls but the baris supported in a suitable opening providedin the center core so that themeta when poured in the mold, envelops and embeds the ends of said bar. The bar thereb becomes strongly anchored in i ,40 the side walls, but in a manner so that openings cannot be formed through the outer face for the admission of air. The bar in this case serves as a transverse tie member to tie together the side walls at their tops. 45 The'box described is simple of construction, as it is practically a single integral cast- .ing andcan e cast in a mold with ver little additional coring over the method fo lowed in the manufacture of prior boxes. The top is so stren thened that distortion of the parts is practice. ly overcome and consequently the life of the box is very great.

\While' the box is shown as provided with a symmetrical arched roof, I wish it under- 5 stoodjthat the invention applies equally as well to a box with a roof higher at its center than at its sides, such as a hip roof, or to a flat roofed box, o1- to a roof composed of one 1. An annealing box having side and end \walls and roof, and a transverse tic member- 65 connecting the sides at the juncture of theof the chord and having its ends provided wit-h anchoring means embedded in the side walls.

casting, and a lransun'se lie bar connecting the sides and having anchoring means its 10 ends. the metal nf the sides bemg east, around said anehm'ing means.

. In testimony whereof, I the said WILLIAM B. Bnxxm'r have hereunto set my hand. WILLIAM B. BENNE'IT, Witnesses:

Rum-211T TOTTEX, J. R. KELLER. 

